Re-add --rust-target to replace --unstable-rust

Instead of specifying whether or not to use stable, specify the Rust
release to support (one of several stable/beta releases or nightly).
The `--unstable-rust` option is still accepted and implies nightly.

The definitions of `RustTarget` and `RustFeatures` are created with
macros.

For each test that uses unions, there is a version that uses the latest
stable and 1.0.

This also fixes the bug where unions were generated with non-Copy
fields.

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/headers/struct_with_nesting_1_0.h b/tests/headers/struct_with_nesting_1_0.h
new file mode 100644
index 00000000..94717a9e
--- /dev/null
+++ b/tests/headers/struct_with_nesting_1_0.h
@@ -0,0 +1,19 @@
+// bindgen-flags: --rust-target 1.0 --with-derive-hash
+
+struct foo {
+    unsigned int a;
+    union {
+        unsigned int b;
+        struct {
+            unsigned short c1;
+            unsigned short c2;
+        };
+
+        struct {
+            unsigned char d1;
+            unsigned char d2;
+            unsigned char d3;
+            unsigned char d4;
+        };
+    };
+};